Just about the only way to improve on <a href="http://www.diyaudio.com/forums/showthread.php?s=&threadid=2451">tortello's beautiful Zen headphone amp</a> is to go for an Aleph headphone amp. The advantages are the balanced FET front-end and the DC-coupled output. This design is specified to put 500mW into Grado headphones, or other phones with about 32Ω impedance. It should also drive a small speaker, and indeed has done so in a breadboard incarnation.
Right now the only thing I'm not liking is the high value of the current sense resistor. I used it in my breadboard mockup but I might change it for something smaller.
One channel shown.
Right now the only thing I'm not liking is the high value of the current sense resistor. I used it in my breadboard mockup but I might change it for something smaller.
One channel shown.
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Re: Powersupply
I have listened to one channel on a breadboard. It sounds rather bad! But it is powerful and the bad sound is a result of poor layout, I hope.
My previous headphone amp was the Sheldon Stokes design seen on Headwize.
I am using four separate Sulzer regulators with AD797 error amp and ZTX869 for the pass transistor. The power dissipation is low enough to not require a big power transistor.
Cheers
Edwin Dorre said:
I have listened to one channel on a breadboard. It sounds rather bad! But it is powerful and the bad sound is a result of poor layout, I hope.
My previous headphone amp was the Sheldon Stokes design seen on Headwize.
swede said:
I am using four separate Sulzer regulators with AD797 error amp and ZTX869 for the pass transistor. The power dissipation is low enough to not require a big power transistor.
Cheers
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